Measurement of local mechanical properties is an important topic in the fields of nanoscale device fabrication, thin film deposition and composite material development. Nanoindentation instruments are commonly used to study hardness and related mechanical properties at the nanoscale. However, traceability and uncertainty aspects of the measurement process often remain left aside. In this contribution, the use of a commercial nanoindentation instrument for metrology purposes will be discussed. Full instrument traceability, provided using atomic force microscope cantilevers and a mass comparator (normal force), interferometer (depth) and atomic force microscope (area function) is described. The uncertainty of the loading/unloading curve measurements will be analyzed and the resulting uncertainties for quantities, that are computed from loading curves such as hardness or elastic modulus, are studied. For this calculation a combination of uncertainty propagation law and Monte Carlo uncertainty evaluations are used.
The project 19RPT02 “Improvement of the realisation of the mass scale” (EMPIR Call 2019 – Energy, Environment, Normative and Research Potential) has just started.<br />Its aim is to improve the quality of one of the most important tasks in mass metrology, the realisation of the mass scale. After the new definition of the kilogram this technique is getting more important.
A comparison of sub-milligram mass standards was undertaken within EURAMET between NPL (as the pilot laboratory), INM (Romania), CEM (Spain), CMI (Czech Republic), SMU (Slovakia) and NSC IM (Ukraine). The weights circulated had nominal values of 500 micrograms, 200 micrograms (2 weights), 100 micrograms and 50 micrograms.
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To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.
The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Main text
In order to demonstrate the equivalence in calibration of 500 kg mass standard, a supplementary comparison has been carried out by 20 members of EURAMET. The overall result shows a good consistency among the participants.
To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.
The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
In order to demonstrate the equivalence in calibration of mass standards among National Metrology Institutes (NMIs) of EURAMET this key comparison (KC) on 1 kg stainless steel mass standards has been carried out under the auspices of EURAMET. The comparison was undertaken with reference to the International Prototype Kilogram (IPK) as the definition of the unit of mass. The overall result shows good consistency among the participants.
Main text
To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.
The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Determination of volume of mass standards is key to the precise determination of the mass due to the effect of air buoyancy force. The buoyancy force can be either reduced by mass determination in low pressure or enlarged for determination of the apparent mass using vessel filled with liquid. Standard method for volume calibration of weights is by comparison in liquid as described in document OIML R111. The report shows results of calibration of volume of stainless-steel mass standards of nominal mass 1 kg in low pressure and liquid. Author showed both methods produced comparable results with maximum differences of 0.002 cm3 when adjusted for standard temperature of 20 °C. Typical uncertainty of volume for both methods is 0.002 cm3. Major source of uncertainty is volume of the reference weight. Author conclude both methods produce consistent results so the method of volume calibration in low pressure can be used instead of the hydrostatic weighing. Advantage of this approach is both mass and volume of the weights are measured using the same mass comparator with less manipulation. This study will help to establish the procedures for dissemination and transfer of the mass unit from vacuum to ambient conditions in the institute of the author.
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